Short Essay On Ozone Depletion

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Ozone is a form of shield that sits 15-30 km above the earth’s surface in the region known as stratosphere.Ozone depletion affects many species at every stage of their life cycle. Plankton (phytoplankton and bacterioplankton) are threatened by increased UV radiation.Marine phytoplankton play a fundamental role in both the food chain as well as the oceanic carbon cycle.It is formed when oxygen molecules absorb ultraviolet photons, and undergo a chemical reaction known as photo dissociation or photolysis.Ultraviolet radiations (UVR), are high energy electromagnetic waves emitted from the Sun.The real threat comes from UV-B, which can enter the Earth's atmosphere, and has adverse effects.Ozone layer depletion first captured the attention of the whole world in the latter half of 1970, and since then, a lot of research has been done to find its possible effects and causes.Let us take a look at how ozone depletion affects different life forms.Ozone depletion is listed as one of the causes for the declining numbers of amphibian species.At the same time, increase in the level of ozone in the lower atmosphere can enhance the ability of sunlight to synthesize vitamin D, which can be regarded as an important beneficial effect of ozone layer depletion.Growing concern for ozone depletion led to the adoption of the Montreal Protocol in 1987, in order to reduce and control industrial emission of chlorofluorocarbons (CFCs).


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